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90-830234R3 DECEMBER 1997 MID-SECTION - 5C-15

Shock Function Up

Oil inside the down cavity is locked in a static position

by the closed pressure operated valve (f), the manual

release valve (p) and the manifold reverse suction

valve (o). If the outboard strikes an underwater object

while in forward gear the piston rod (a) will try to rap-

idly extend from the cylinder (w), the pressure in-

creases inside the trim cylinder down cavity and con-

necting passages. When the pressure increases to

the level required, the impact relief valves (v), located

inside the shock piston (u), will open and allow the

fluid to pass through the shock piston. As the fluid

passes through the piston, the piston rod (a) will ex-

tend from the trim cylinder. The memory piston (t) is

held in position by vacuum, created by the oil in the

up cavity being locked in a static position. Therefore;

oil passing through the shock piston is trapped be-

tween the memory piston (t) and shock piston (u).

Mercury 90 Service Manual

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